Loosen the screws that fasten the cover on the control unit with a screwdriver. Pull the cover off the unit.
Insert the multiconductor cord from the welding gun through the access hole in the front of the control box.
Loosen the eight terminals inside the control box with a screwdriver. Insert the numbered wires in their corresponding terminals and tighten them down.
Tighten the wire compression mechanism, where the wire penetrates the box, to hold the multiconductor cord in place.
Run the contactor control cord to the welding power source and plug it into the outlet by pushing them together.
Run the 110-volt plug to a wall outlet and push it into the outlet.
Place the cover back on the control unit and fasten it with the removed screws.